We are going to take a Swift feature into the browser. We will set up a WebAssembly application from scratch, show how to run and debug it, and even set up some basic UI. And then we will integrate our existing model into it, all powered by the magic of Swift’s Observation framework.

It’s time to go cross-platform! We will take a feature written in Swift and use it in vastly different situations, including not only SwiftUI and UIKit, but beyond Apple’s frameworks and ecosystems. We will start with a baby step and introduce our feature to a third party view paradigm, Airbnb’s Epoxy.

We finish building a modern UIKit application with brand new state-driven tools, including a complex collection view that can navigate to two child features. And we will see that, thanks to our back-port of Swift’s observation tools, we will be able to deploy our app all the way back to iOS 13.

In this series we go back to basics with a deep dive into the subject of Equatable types. Equatability is a deceptively simple topic. It is a surprisingly tricky protocol that has some very specific semantics that must be upheld baked into it, and there are many misconceptions on how one can or should conform types to this protocol.

We round out our series with one more feature: the ability for our users to manage a list of their favorite facts. It will allow us to explore a complex side effect, persistence, and show how the same Swift code can save and load data across iOS app launches and web page refreshes.

We’ve already covered a lot of ground and could have ended the series last week, but let’s do a few more things to show just how powerful cross-platform domain modeling can be by adding a new feature to our cross-platform application and see just how easy it is to integrate with SwiftUI, UIKit, and WebAssembly.